CN104284367A

CN104284367A - Channel distribution method and device for temporary block flow

Info

Publication number: CN104284367A
Application number: CN201310273677.8A
Authority: CN
Inventors: 冯新华; 赵振宇; 杨锡继; 孙寅
Original assignee: China Mobile Group Jiangsu Co Ltd
Current assignee: China Mobile Group Jiangsu Co Ltd
Priority date: 2013-07-01
Filing date: 2013-07-01
Publication date: 2015-01-14
Anticipated expiration: 2033-07-01
Also published as: CN104284367B

Abstract

The invention discloses a channel distribution method for temporary block flow. The method comprises the steps of obtaining the seizure rate of TFI resources of current PDCH sets of a cell when the TBF is established, adding the PDCH sets when the seizure rate of the TFI resources exceeds a set first threshold, and distributing the established TBF to the added PDCH sets; when the PDCH sets are not added, distributing the established TBF to the PDCH set with the lowest loading efficiency; adjusting the number of PDCHs in the PDCH sets according to the loading efficiencies of the PDCH sets. The invention further discloses a channel distribution device for the temporary block flow at the same time. By means of the channel distribution method for the temporary block flow and the channel distribution device for the temporary block flow, the number of the PDCHs distributed to the cell can be adjusted dynamically, the utilization rate of the wireless resources is increased, and meanwhile, the situation that a service request does not have access due to the fact that only the loading efficiency is considered is avoided.

Description

Channel allocation method and device for temporary block flow

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for allocating channels of a temporary block flow.

Background

In Global System for Mobile communications (GSM) Packet transmission, allocation of Packet Data Channels (PDCHs) is performed in a PDCH set, which is commonly referred to as a PSET. The PDCH is a bearer logical entity of wireless packet data on an air interface, a Temporary Block Flow (TBF) is a connection between a Mobile Station (MS) and a network side, and the MS and the network side transmit packet traffic data on the PDCH through the TBF. All PDCH assignments in a PSET are from the same Traffic Channel (TCH) group, and a PSET may contain up to eight PDCH channels. Each MS can simultaneously support at most two TBFs (one for uplink and one for downlink), and after the TBFs of the MS are established, the network side can reserve PDCH resources according to the multi-slot level, Enhanced Data Rate for GSM Evolution (EDGE) support capability and frequency band support capability of the MS.

In practical applications, the TBF Flow parameter is usually used to indicate the maximum number of TBFs that each PDCH can carry, and each established TBF is assigned a Temporary Flow Indicator (TFI) for uniquely identifying the TBF. When TBF carried by PDCH in PSET exceeds TBFLIMIT, a Packet Control Unit (PCU) starts to apply for new PDCH. If the TBFLIMIT parameter value is set to be larger, the number of TBFs which can be carried by each PDCH is increased, at the moment, under the condition of carrying the same TBFs, the number of the PDCHs required is reduced, more channel resources can be saved, but the data service downloading rate is reduced; if the TBFLIMIT parameter value is set to be smaller, the number of TBFs which can be carried by each PDCH is reduced, the bandwidth of each TBF is increased, the data service downloading rate is improved, but the required PDCH number is increased at the same time, and the voice congestion is increased.

It can be seen that adjustment of the TBFLIMIT parameter affects the PDCH allocation and thus the overall capacity of the cell. When the cell service changes, if the TBFLIMIT parameter cannot be adjusted in time, the voice service and the data service mutually seize channel resources, which causes resource waste.

In addition, at present, services in the GPRS network are various, service characteristics expressed by different services are different, and the packet length difference of different services is large. For example, the packet length of video and multimedia services exceeds 800 bytes (byte), while the packet length of instant messaging services is only 200 to 450 bytes. Under the same TBFLIMIT parameter setting, the PDCH bearing efficiency has larger difference, the perception of users is obviously different, and the utilization rate condition of the PDCH cannot be truly reflected by the size of the TBFLIMIT.

Therefore, under different service scenarios, PDCH resource allocation is performed according to the TBFLIMIT parameter, which cannot meet the requirements of real services, resulting in unbalanced and inefficient network resource utilization.

Disclosure of Invention

In view of the above, the present invention provides a method and an apparatus for allocating channels of a temporary block flow, which can dynamically adjust the PDCH number allocated to a cell, thereby improving the utilization rate of radio resources.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for channel allocation of a Temporary Block Flow (TBF), the method comprising:

when TBF is established, acquiring the occupancy rate of temporary flow indicator TFI resources of the current packet data channel PDCH set of a cell, increasing the PDCH set when the occupancy rate of the TFI resources exceeds a set first threshold value, and distributing the established TBF to the increased PDCH set; when the PDCH set is not increased, the established TBF is distributed to the PDCH set with the lowest bearing efficiency;

and adjusting the PDCH number in each PDCH set according to the bearing efficiency of each PDCH set.

Preferably, when the PDCH set is increased, the method further comprises: one or two PDCHs are initially allocated for the increased PDCH set.

Preferably, the adjusting the PDCH number in each PDCH set according to the bearer efficiency of each PDCH set includes:

when the bearing efficiency of the PDCH set exceeds a set second threshold value, adding PDCH for the PDCH set;

when the bearing efficiency of the PDCH set is greater than a set third threshold and less than a set second threshold, keeping the PDCH number unchanged;

and when the bearing efficiency of the PDCH set does not exceed a set third threshold value, reducing the PDCH in the PDCH set.

Preferably, after the PDCH numbers in each PDCH set are adjusted according to the bearer efficiency of each PDCH set, the method further includes:

and respectively readjusting TBFs carried on the PDCHs according to the adjusted PDCHs in each PDCH set so as to balance the TBFs carried on the PDCHs in each PDCH set.

Preferably, when the bearer efficiency of the PDCH set does not exceed a third threshold, reducing the PDCH in the PDCH set includes:

and transferring all TBFs carried on the PDCH carrying the least TBFs to other PDCHs in the PDCH set, and releasing the PDCH after the TBFs are transferred.

A channel assignment device for a temporary block flow, TBF, the device comprising: the device comprises a first acquisition unit, a first determination unit, a second acquisition unit, a second determination unit and a first adjustment unit; wherein,

the first obtaining unit is configured to obtain a TFI resource occupancy rate of a current PDCH set of a cell when a TBF is established;

the first determining unit is configured to increase a PDCH set and allocate the established TBF to the increased PDCH set when the TFI resource occupancy exceeds a set first threshold;

the second obtaining unit is configured to obtain a carrying efficiency of each PDCH set of the cell;

the second determining unit is configured to allocate the established TBF to a PDCH set with the lowest bearer efficiency when the TFI resource occupancy does not exceed the set first threshold;

the first adjusting unit is configured to adjust PDCH numbers in each PDCH set according to the bearer efficiency of each PDCH set.

Preferably, the first determination unit is further configured to:

when a PDCH set is increased, one or two PDCHs are initially allocated to the increased PDCH set.

Preferably, the first adjusting unit is further configured to:

Preferably, the apparatus further includes a second adjusting unit, configured to re-adjust the TBFs already carried on the PDCH according to the adjusted PDCH numbers in each PDCH set, so as to equalize the TBFs carried on each PDCH in each PDCH set.

Preferably, the first adjusting unit is further configured to transfer all TBFs carried on the PDCH carrying the least TBFs to other PDCHs in the PDCH set, and release the PDCH after transfer of the TBFs.

The invention provides a channel allocation method and a device of temporary block flow, which are characterized in that when TBF is established, the temporary flow indicator TFI resource occupancy rate of the current packet data channel PDCH set of a cell is obtained, when the TFI resource occupancy rate exceeds a set first threshold value, the PDCH set is increased, and the established TBF is allocated to the increased PDCH set; when the PDCH set is not increased, the established TBF is distributed to the PDCH set with the lowest bearing efficiency; and adjusting the PDCH number in each PDCH set according to the bearing efficiency of each PDCH set. Therefore, the invention dynamically adjusts the PDCH number allocated to the cell according to the bearing efficiency, effectively avoids the condition of unbalanced utilization of wireless resources caused by the difference of service characteristics, reduces the probability of occupying large resources by small services and improves the service perception of users. Meanwhile, the invention considers that the TBF number carried on the PDCH has an upper limit, adds the PDCH set in time according to the TFI resource occupancy rate, and selects the PDCH set with low carrying efficiency to distribute the PDCH, thereby improving the utilization rate of wireless resources, fully ensuring the access performance of users and avoiding the condition that service requests can not be accessed because of only considering the carrying efficiency. In addition, the TBF carried on the PDCH is adjusted again according to the adjusted PDCH number, the TBF carried on each PDCH is balanced, on the premise of ensuring good perception of a user, redundant PDCHs are reduced, and the utilization rate of wireless resources is improved.

Drawings

Fig. 1 is a schematic flow chart illustrating an implementation of a method for allocating channels of a temporary block flow according to the present invention;

fig. 2 is a schematic flow chart illustrating channel allocation and temporary block flow establishment of a temporary block flow according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a channel allocation apparatus for temporary block flows according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic flow chart of an implementation of a method for allocating channels of a temporary block flow according to the present invention, as shown in fig. 1, the method includes the following steps:

step 101: when TBF is established, acquiring the occupancy rate of temporary flow indicator TFI resources of the current packet data channel PDCH set of a cell, increasing the PDCH set when the occupancy rate of the TFI resources exceeds a set first threshold value, and distributing the established TBF to the increased PDCH set; when the PDCH set is not increased, the established TBF is distributed to the PDCH set with the lowest bearing efficiency;

specifically, when the PDCH set is increased, the method further includes: one or two PDCHs are initially allocated for the increased PDCH set.

Specifically, when the TFI resource occupancy rate does not exceed a set first threshold, the PDCH set is not increased.

Preferably, the first threshold may be 80%.

Step 102: and adjusting the PDCH number in each PDCH set according to the bearing efficiency of each PDCH set.

Specifically, the adjusting the PDCH number in each PDCH set according to the bearer efficiency of each PDCH set includes:

Wherein the bearer efficiency is equal to the number of radio blocks used on the PDCH per unit time divided by the number of radio blocks available on the PDCH per unit time.

Here, when adding PDCH for the PDCH set, the added PDCH is a new PDCH, that is, no TBF is carried on the added PDCH.

Here, when the bearer efficiency of the PDCH set does not exceed a third threshold, reducing the PDCH in the PDCH set includes:

Here, the carried TBF is an established TBF.

For example, the second threshold may be 50% and the third threshold may be 30%.

Further, after the PDCH numbers in each PDCH set are adjusted according to the bearer efficiency of each PDCH set, the method further includes:

For example: assuming that only 1 PDCH exists in a PDCH set, 10 TBFs are carried on the PDCH at most, and 7 TBFs are carried, the carrying efficiency of the PDCH set is 70%, since the second threshold is exceeded by 50%, PDCHs need to be added to the PDCH set, assuming that one PDCH is added to the PDCH set, at this time, the number of TBFs carried on each PDCH needs to be adjusted, and 3 TBFs on the original PDCH in the PDCH set can be migrated to the newly added PDCH, so that TBFs carried by each PDCH in the PDCH set are substantially balanced.

For another example: assuming that only 2 PDCHs exist in a PDCH set, 10 TBFs are carried on each PDCH, and the 2 PDCHs carry 1 and 3 TBFs respectively, the carrying efficiency of the PDCH set is 20%, since the carrying efficiency is lower than the third threshold by 30%, the PDCHs in the PDCH set need to be reduced, at this time, the TBFs on the PDCHs carrying 1 TBF in the PDCH set can be migrated to the PDCHs carrying 3 TBFs, and after the migration is completed, the original PCDH carrying 1 TBF is released.

Fig. 2 is a schematic flow chart of channel allocation and temporary block flow establishment of a temporary block flow according to an embodiment of the present invention, and as shown in fig. 2, the flow chart includes the following steps:

step 201: a wireless resource management system receives a TBF establishment request;

here, after receiving a TBF establishment request sent by the MS, the radio resource management system on the network side initializes MS instance resources and performs initialization work for next PDCH allocation.

Specifically, the radio resource management system determines whether an available PDCH exists in the current cell, and if no available PDCH exists, activation of the PDCH needs to be performed; if there is no PDCH channel that can be activated, the PDCH allocation fails.

The step 201 is the same as the prior art, and is not described herein again.

In the case that there is an available PDCH, step 202 is performed.

Step 202: the wireless resource management system judges the TFI allocation condition of the existing PSET of the cell, namely judges whether the TFI resource occupancy rate exceeds a first threshold value, if so, executes step 203; if not, go to step 204;

here, the first threshold may be set according to specific situations, for example, the first threshold may be set to 80%.

Step 203: activating a new PSET;

here, if a new PSET is activated, TBF allocation is performed in the newly activated PSET, and the PDCH number initially allocated for the pre-established TBF is small, for example, the PDCH number may be 1 or 2.

Step 204: selecting PSET with lower bearing efficiency to carry out TBF distribution;

step 205: periodically acquiring the bearing efficiency in each PSET, and adjusting the PDCH number according to the bearing efficiency;

specifically, the step 205 specifically includes:

step 205 a: judging whether the bearing efficiency is greater than a set second threshold value, and if so, executing the step 205 b; otherwise, go to step 205 c;

step 205 b: the PDCH number in the PSET is increased,

step 205 c: judging whether the bearing efficiency is greater than or equal to a set third threshold and less than or equal to a set second threshold; if so, go to step 205 d; otherwise, go to step 205 e;

step 205 d: keeping the PDCH number unchanged;

step 205 e: judging whether the PDCH bearing efficiency is smaller than a set third threshold value, if so, executing a step 205 f; otherwise, go to step 206;

step 205 f: the PDCH number in PSET is reduced.

Here, the period for acquiring the carrying efficiency in each PSET may be set according to specific situations, for example, the period may be set to 10 s.

The values of the second threshold and the third threshold may be set according to specific situations, for example, the second threshold may be set to 30% and the third threshold period may be set to 70%.

Step 206: TBF allocation and establishment is complete.

After the TBF allocation and establishment are completed, step 205 is repeatedly executed to adjust the PDCH number in each PSET. After the PDCH number in each PSET is adjusted, the TBFs already carried on the PDCH are adjusted again according to the adjusted PDCH number in each PSET, so that the TBFs carried on the PDCHs in each PSET are substantially equalized.

If a new TBF establishment request exists, the steps 201 to 206 are executed again from step 201.

In the embodiment, TBF establishment and scheduling are performed based on TFI resource occupancy rate and bearing efficiency in PSET, so that redundant PDCH can be reduced as much as possible on the premise of ensuring good user perception, and the utilization rate of wireless resources is improved; the access performance of the user data service is guaranteed, and congestion is avoided; in addition, different resource allocation strategies do not need to be formulated for different services, the service resource occupation condition of the user can be automatically adapted, and all service scenes are adapted.

Fig. 3 is a schematic structural diagram of a channel allocation apparatus for temporary block flows according to the present invention, and as shown in fig. 3, the apparatus includes: a first acquisition unit 31, a first determination unit 32, a second acquisition unit 33, a second determination unit 34, and a first adjustment unit 35; wherein,

the first obtaining unit 31 is configured to obtain a TFI resource occupancy rate of a current PDCH set of a cell when a TBF is established;

the first determining unit 32 is configured to increase a PDCH set when the TFI resource occupancy exceeds a set first threshold, and allocate the established TBF to the increased PDCH set;

the second obtaining unit 33 is configured to obtain the bearer efficiency of each PDCH set of the cell;

the second determining unit 34 is configured to allocate the established TBF to a PDCH set with the lowest bearer efficiency when the TFI resource occupancy does not exceed the set first threshold;

the first adjusting unit 35 is configured to adjust PDCH numbers in each PDCH set according to the bearer efficiency of each PDCH set.

Specifically, the first determining unit 32 is further configured to:

Specifically, the first adjusting unit 35 is further configured to:

Specifically, the first adjusting unit 35 is further configured to transfer all TBFs carried on the PDCH carrying the least TBFs to other PDCHs in the PDCH set, and release the PDCH after the TBFs are transferred.

Further, the apparatus further includes a second adjusting unit 36, configured to re-adjust the TBFs already carried on the PDCH according to the adjusted PDCH numbers in each PDCH set, so as to equalize the TBFs carried on each PDCH in each PDCH set.

Specifically, when the first adjusting unit 35 adds a PDCH to the PDCH set, the second adjusting unit 36 readjusts the TBF on each PDCH in the PDCH set after adding the PDCH according to the distribution of the current TBF on the PDCH, so that the TBFs borne on each PDCH in the cell are substantially balanced; when the first adjusting unit 35 keeps the PDCH number in the PDCH set unchanged, the second adjusting unit 36 still adjusts the distribution of the current TBF on the PDCH, so that the TBFs carried on each PDCH in the cell are substantially balanced; when the first adjusting unit 35 determines to reduce the PDCH in the PDCH set, and completely transfers the TBF carried on the PDCH carrying the least TBF to other PDCHs in the PDCH set, and releases the PDCH after the TBF transfer, the second adjusting unit 36 readjusts the TBF on each PDCH in the PDCH set after the PDCH reduction according to the distribution of the current TBF on the PDCH, so that the TBFs carried on each PDCH in the cell are substantially balanced.

Those skilled in the art will understand that the implementation functions of each processing unit in the channel allocation apparatus for the temporary block flow shown in fig. 3 can be understood by referring to the related description of the channel allocation method for the temporary block flow. Those skilled in the art will appreciate that the functions of the processing units in the channel allocation apparatus for temporary block flows shown in fig. 3 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.

The invention carries out the distribution of PDCH and the establishment of TBF according to the bearing efficiency, so that the network has the self-adaptive capacity for the service requirement, aiming at the small-packet service, such as the instant communication service, the occupation of the resource by the user of the service unit is lower, the bearing efficiency is lower, and the requirement of the service quality of a plurality of users can be met by providing less PDCH; for large packet services, such as FTP downloading and multimedia services, users of such service units have high resource occupation and high bearing efficiency, and more PDCHs are provided to meet the service quality requirements.

Meanwhile, considering that the number of TBFs carried on the PDCH has an upper limit, generally speaking, the maximum TFI is 31, only the carrying efficiency is taken as a condition for distributing the TBFs, and under the condition that a large amount of packet services exist, the probability of user access failure caused by insufficient TFI resources is increased, so that the invention also combines the relevant TFI resource usage statistics, namely the TFI resource occupancy rate to distribute and schedule the TBFs, and avoids the condition that service requests cannot be accessed because of only considering the carrying efficiency.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A channel allocation method for a Temporary Block Flow (TBF), the method comprising:

2. The method of claim 1, wherein when increasing the PDCH set, the method further comprises: one or two PDCHs are initially allocated for the increased PDCH set.

3. The method of claim 1, wherein the adjusting the PDCH numbers in each PDCH set according to the bearer efficiency of each PDCH set comprises:

4. The method of claim 1, wherein after adjusting the PDCH numbers in each PDCH set according to the bearer efficiency of each PDCH set, the method further comprises:

5. The method of claim 3, wherein reducing PDCHs in the PDCH set when the bearer efficiency of the PDCH set does not exceed a set third threshold comprises:

6. A channel assignment device for a Temporary Block Flow (TBF), the device comprising: the device comprises a first acquisition unit, a first determination unit, a second acquisition unit, a second determination unit and a first adjustment unit; wherein,

7. The apparatus of claim 6, wherein the first determining unit is further configured to:

8. The apparatus of claim 6, wherein the first adjusting unit is further configured to:

9. The apparatus of claim 6, further comprising a second adjusting unit, configured to readjust the TBFs carried on the PDCHs according to the adjusted PDCH numbers in each PDCH set, respectively, so as to equalize the TBFs carried on the PDCHs in each PDCH set.

10. The apparatus of claim 8, wherein the first adjusting unit is further configured to transfer all TBFs carried on the PDCH with the fewest TBFs carried to other PDCHs in the PDCH set, and release the PDCH after the TBF transfer.